Patent US1214635A successfully refreshed from Google Patents.
Patent US3271329A successfully refreshed from Google Patents.
US3271329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing polymers derived from phosphites and glycols
Assignee: Eastman Kodak Co
•
Filing: 1958-09-19
•
Granted: 1966-09-06
•
Expires: 1978-09-19
Abstract
No abstract record available.
Inventors
- 👤 Jr Harry W Coover
- 👤 Richard L Mcconnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:33
CPC Classifications
C; C08; C08G; C08G79/00; C08G79/02; C08G79/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
A METHOD FOR PRODUCING HIGH MOLECUALR WEIGHT ORGANO-PHOSPHORUS POLYMERS WHICH COMPRISES TRANSESTERIFYING AT A TEMPERATURE WITHIN THE RANGE OF 0-350*C. SUBSTANTIALLY EQUIMOLAR PORPORTIONS OF HYDROGEN PHOXPHITE COMPOUND AND DIHYDROXY COMPOUND IN A REACTION MIXTURE SELECTED FROM THE CLASS CONSISTING OF (A) REACTION MIXTURES THAT COMPRISE (1) A HYDROGEN PHOSPHITE COMPOUND HAVING THE FORMULA
Claim 2
Independent Claim
53 words
A METHOD FOR PRODUCING HIGH MOLECUALR WEIGHT ORGANO-PHOSPHORUS POLYMERS WHICH COMPRISES TRANSESTERIFYING AT A TEMPERATURE WITHIN THE RANGE OF 0-350*C. SUBSTANTIALLY EQUIMOLAR PORPORTIONS OF HYDROGEN PHOXPHITE COMPOUND AND DIHYDROXY COMPOUND IN A REACTION MIXTURE SELECTED FROM THE CLASS CONSISTING OF (A) REACTION MIXTURES THAT COMPRISE (1) A HYDROGEN PHOSPHITE COMPOUND HAVING THE FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |